The Microsoft Lumia 640 sports a 5-inch 720p display and an 8-megapixel camera, while the Lumia 640 XL bumps that spec up to a 5.7-inch 720p display and a 13-megapixel camera with ZEISS optics.

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Microsoft Lumia 640 XL

As we've come to expect from the Lumia range, both have an attractively colourful design while tucked away under-the-hood is a powerful, but highly affordable, tech-spec based around the Snapdragon 400 processor.

So what advantages does the Snapdragon 400 bring to the Lumia 640 and Lumia 640 XL? It's a speedy processor with integrated LTE, and powerful CPU and GPU for superior graphics, so you'll be able to play even the most advanced games from the Windows Phone Store without a hitch, not to mention make the most of HD video content and other media.

Another advantage of the Snapdragon 400 is how energy efficient it is. With the Snapdragon processor at the heart of the Lumia 640 and Lumia 640 XL they can attain up to 23.7 hours of talk time or 39 days of standby time. In other words, you won't be nursing your phone’s battery come the end of a busy day of talking, texting, web browsing, and app using.

The final part of the Snapdragon 400 package that makes it so well suited to the Lumia 640 and Lumia 640 XL is its integrated 4G LTE compatibility. This means that you can get on available super-fast 4G mobile networks and download at lightning speeds.

If that magic 4G symbol shows up on your phone, it means you can download large files at broadband-like speeds, and stream music and Full HD video with minimal buffering or waiting.So, the Snapdragon 400 forms an important part of the Lumia 640 and Lumia 640 XL package, providing a welcome boost to gaming, media streaming and all-day performance.